Determining the change in temperature

A person sitting in a room has a heat output of 200W. Please calculate...

A) How much energy does a room of 45 people release over a course of 1 hour?
B) Assuming that all the energy in part a is transferred to a room of 300 M^3 of air. The air has a specific heat capacity of 1020 J/KxKg and density of 1.20. If none of the heat escapes, how much will the temperature change over time of 50 minutes?

2. Relevant equations

3. The attempt at a solution

For part A I found that the energy would be 45x200x3600 seconds = 3.24 x 10^7

For part B however, I tried to determine the mass by rearranging the density formula, multiplying density by volume. using that number in Q=Mc (delta T), and rearranging the formula, i get a change of around 60 Kelvin. But I know that can't be right...What am I doing wrong?